Hint 1
It's mate in 4.
Hint 2
Nf7+ then Nh6+
The solution is here - https://www.chess.com/analysis/game/live/120785379743?tab=analysis&move=59 - check top of the right sidebar.
I started trying something new when I watch speed chess.
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Sometimes I watch players stronger than me but not too much stronger than me.
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I keep the evaluation bar off so I'm forced to think without hints. I'm way too addicted to the elav bar.
Spoiler - I mention what I saw in real time.
I watched this game a few minutes ago. I thought I was clever to notice Nf7+ and Nxd8 which wins the rook. But even though I love smothered mates - I didn't even think to look for that. When white played Nh6+ I nearly groaned. What the- Oh! I missed it! Fuuuuuuck!
Nxd8 also leads to a mate in 3 or 4. Black has to respond Kh8 or Kf8, so Qe8 or Qf7 respectively. This is a cool play as well though
I don't think Nxd8 would be legal. EDIT: Oh, I see it, next move. My bad. Though I think you need the smother to avoid Qxe6.